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Optiques Fullum Folded Newtonian 45" f/3.5

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Original price $236,500.00
Original price $236,500.00 - Original price $236,500.00
Original price $236,500.00
Current price $189,200.00
$189,200.00 - $189,200.00
Current price $189,200.00

Lead-time: TBA

Ships To: United States & Canada 🇺🇸 🇨🇦

✓ Free U.S. Shipping (on most orders over $150 USD)

✓ Price Match Available

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✓ Questions? Call Us 1-800-860-3429

Shipping & Returns

We offer free U.S. shipping to the lower 48 States - on most orders over $150 USD. Some limitations may apply.

Shipping fees will apply on most orders shipping across Canada, with some exceptions.

We offer a 30 Day Return Policy on most of the products that we carry.

For full details on our Shipping & Returns Policy, please click here.


The vast majority of products that we sell, with a few exceptions, are covered under Warranty.

To view the Warranty details for each brand that we sell, including products that do not qualify for Warranty, please visit here.

NOTE: These Telescopes are custom-made systems. Please contact us to discuss your specific requirements at, or feel free to call us during our posted business hours at 1-800-860-3429. The final price can vary depending on your custom requirements. The price does not include crating and shipping.

Fullum-folded Newtonian®: For large telescopes of 30 inches and more, Optiques Fullum developed a unique “Fullum-folded Newtonian” structure.  In this configuration, a parabolic primary mirror with a very short focal (F/3.5-F/4) is coupled to a secondary mirror placed much lower than normal, which will redirect the optical axis at a 17.5-degree angle instead of 45 degrees.  This results in a more secure focal spot for the observer.

  • For example, a 50-inch F/3.5 telescope ocular support would normally be made at a height of 18 feet.  By using the unique “Fullum Folded” structure, the ocular support will be at a height of only 8.5 feet.


  • Optical design: Newtonian reflector
  • Objective diameter: 1143 mm
  • Focal length: 4000 mm
  • Focal ratio: f/3.5
  • Resolving power: 0.1 arc second
  • Stellar limiting magnitude: 17.99
  • Max. magnification: 2857 x (theoretical)
  • Light gathering power: 26,662 times the human eye

In the following video, Normand Fullum describes how he developed, and produces, his lightweight Techno-Fusion primary mirrors for the Fullum Folded Newtonian telescopes:

 In the following video, the RASC (Royal Astronomical Society of Canada) gets a tour of Normand Fullum's workshop:

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